When mid-twentieth-century psychologists gave adults of different ages the Wechsler Adult Intelligence Scale (WAIS),they found that people reached their intellectual peak in their twenties.The bias here was that the researchers did not:

Question

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The researchers did not account for the fact that people of different ages in their sample had different levels of education, which would have affected their scores on the intelligence test. Therefore, their conclusion about when people reach their intellectual peak may not be accurate.

When Mid-Twentieth-Century Psychologists Gave Adults of Different Ages the Wechsler